128502801 has 16 divisors (see below), whose sum is σ = 217571200. Its totient is φ = 73430064.

The previous prime is 128502797. The next prime is 128502811. The reversal of 128502801 is 108205821.

It is not a de Polignac number, because 128502801 - 2² = 128502797 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (128502811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 339766 + ... + 340143.

It is an arithmetic number, because the mean of its divisors is an integer number (13598200).

Almost surely, 2^128502801 is an apocalyptic number.

It is an amenable number.

128502801 is a deficient number, since it is larger than the sum of its proper divisors (89068399).

128502801 is an equidigital number, since it uses as much as digits as its factorization.

128502801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679925 (or 679919 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 128502801 is about 11335.9075948951. The cubic root of 128502801 is about 504.6274427623.

It can be divided in two parts, 12850 and 2801, that added together give a palindrome (15651).

The spelling of 128502801 in words is "one hundred twenty-eight million, five hundred two thousand, eight hundred one".